Pythagoras said: “Mathematical principles are the principles of all things”, in other words, the basic structure of “Being” is mathematical. Everything, in some way, can be explained in mathematical terms. It is the mathematical principles that make things as they are, that make them distinct.”

“When you can quantify what you are talking about, and express it numerically, then you know something about it; but when you can’t quantify it, when you can’t express it numerically, your knowledge about it is vague and unsatisfactory … ”. Lord Kelvin (1824-1907)
In other words: “Only what is measurable can be improved”

Knowledge about the world around us and the ability to act on it by making decisions depend to a large extent on our ability to make measurements, that is, to quantify attributes through a process of comparison with standards. Therefore, measurements are at the root of the emergence of civilization itself, allowing organizing society, and obtaining knowledge about nature and act effectively on it.

As society grows and becomes more complex, more based on sophisticated knowledge, the greater our dependence on measurements. In this way, the quality of measurements and our confidence in them are fundamental, which requires a discipline of knowledge specifically focused on these issues, Metrology.

If Christopher Columbus had the support of Metrology, he would certainly have used the Earth’s perimeter (40,075 km) instead of 30,600 km, and he had not missed a continent for almost 10,000 km.

Even today, too many people and companies consider the measures they have to be correct, not using Metrology to prove them, incurring big errors and expenses.

The Metrology is the science of measurement and its applications.
Metrology includes all theoretical and practical aspects of measurement, whatever the measurement uncertainty and field of application. The direct objective of the Metrology is Measure, i.e., to determine a numerical measure.

Calibration is a set of operations and measures to establish, under specified conditions, the relationship between indicated values by a measuring instrument, or values represented by a reference material and the corresponding values of the magnitude to be measured.

You can Calibrate or Test your equipment in the EH Lab Calibrations and Tests Laboratory. You can contact us or in option send us a list of equipments with Calibration/Test interval, so that will be sent a proposal for the service.

Set of operations carried out by an agency of the National Legal Metrology (or other authorized body) to verify and confirm that the measuring instrument fully meet regulatory requirements.

To eliminate waste because of non-compliant production or misfit costs.
To understand behaviour of the instruments.
To ensure quality standards in manufactured products.
To ensure traceability of measurements.

All instruments whose accuracy has influence on the quality of the results, either in the production area, which in the Laboratory.
– Production/Laboratory Scales
– Temperature Indicators / Controllers / Loops
– Thermometers
– Thermostats
– Greenhouses
– Autoclaves
– Indicators/pressure gauges
– Pressure switches
– pH and Free Chlorine Meters
– Conductivity meters
– Flow meters
– Etc.

These are the extreme values of the error permitted by specifications, regulations, procedures, etc., for a given instrument.
Defines the maximum accepted values for the |Error| + |Uncertainty| equipment.

It is the algebraic difference between the measurement result and the true value of the measured quantity, that is, the difference between the value indicated by the equipment on Calibration and the generated standard value.

It is the non-negative parameter that characterizes the dispersion of the magnitude values that are attributed to the one measured from the information used.
Associated legislation: European Standard EA-4/02.

It essentially depends on the use intended for the measuring instrument, the economic gain to be obtained and the acceptable values in which the equipment is operating.

In view of the expected return on profit, it includes variables such as the conditions of use, the frequency of use, the associated risk, the drift between Calibrations/Tests, as a correct way of defining the appropriate periodicity and controlling its suitability.

The equipment must be identified by a code (serial number or not) so that it is not confused with other similar equipment. This identification must be visible through a label, where the equipment’s operating interval, resolution, serial number and internal code may also be identified.
A label must also be attached to the equipment to identify the last and the next Calibration/Test.

The Calibration/Test stamps are labels that identify the Calibration/Test status of the equipment, that is, that it has its measurement status controlled by an Accredited Laboratory. The Calibration/Test stamps must unequivocally identify the equipment to which it refers.
The conformity stamps are labels that identify the conformity status of a specific equipment, that is, whether or not it is indicating values within the Acceptance Criterion previously established. It usually indicates whether the equipment is “Approved” or “Failed”, and those identified with “Failed” must be shut down until corrected.
The conformity stamps must unequivocally identify the equipment to which it refers.

Contact us by email geral@ehlab.pt